Cancel your contract- they will try to milk you

I have been with Cell C since 2013. Never had one problem, renewed my 24 month contract in 2015 and in 2017 decided to go to a more cost effective month-to- month contract for data of R99. I cancelled my contract ahead of time, as i should on the 12th of Sep. Precisely a month later I got the notification of cancellation. I never use this contract, for that reason i cancelled it. yet you debited me the full amount. When i cancelled the contract I was informed that the last debit will be on the 1st of October. Your consultant explained a few minutes ago that this amount was for September. Meaning I pay on the 1st of November for September. I'll reluctantly accept this. Firstly your agent in the retentions dept gave me the wrong info when I cancelled in Sept. Please train your people properly. this amount isnt a train smash, but i assume this happens every day, since your people give out the wrong info. Secondly, seeing as if i understand this correctly, i should be debited once more for the month of October, it seems you are planning to overcharge me. Reason being, i checked my sms's and on the 1st of October I received the full data bundle, not a pro-rated one, even though the contract was only active for the first 12 months of October. This means, you are in fact planning to debit me the full amount end of this month or beginning next month. This is unacceptable. I would like your retentions dept to listen to that recording and provide proper feedback to me. I wont be paying for a full months data if the contract wasnt even active for half of the month.